Almost all animals have symmetrical bodies. Bilateral symmetry is almost universal in all animals and is only very rarely ...

A fish with grey and orange scales, with its mouth wide open exposing a row of human-looking teeth A young boy in Oklahoma has caught a bizarre, piranha-like fish with eerily human-like teeth ...

Fierce and gigantic, if you ever see or come across an arapaima fish along the rainforest rivers of the Amazon, then you will ...

Haridy figured that modern-day fish might help her answer the question. So she looked at the tooth-like scales of the embryos of sharks, skates and catfish — and she found nerves.